Rule 236 ↗
You MUST NOT use front or rear fog lights unless visibility is seriously reduced (see Rule 226 ↗) as they dazzle other road users and can obscure your brake lights. You MUST switch them off when visibility improves.
Law RVLR regs 25 & 27
DRIVING IN THE MIST :
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📖 Rule 236 Full Regulations & Explanation
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DRIVING IN THE MIST :
THE RULES OF FOG LIGHT USAGE
WHEN VISIBILITY IS SERIOUSLY REDUCED
Only use during ' Seriously Reduced ' visibility .
According to Rule 236 , fog lights must only be engaged when weather conditions significantly impair your view of the road .
Don't obscure your brake lights .
Rear fog lights are so bright they can mask the illumination of your brake lights , making it harder for following drivers to see when you are slowing down .
AS VISIBILITY IMPROVES
Avoid dazzling other road users . Fog lights are high- intensity ; using them in clear conditions can temporarily biind or distract oncoming drivers and pedestrions .
Switch them OFF as visibility improves
It is a requirement to deactivate both front and rear fog lights once the atmospheric conditions are no longer seriously reduced .
LEGAL COMPLIANCE & STANDARDS
Statutory Law RVLR Regs 25 & 27 : The use and misuse of fog lights are governed by the Road Vehicles Lighting Regulations , making compliance a legal necessity .
Cross - reference Rule 226 : Rule 236 works in conjunction with Rule 226 to define the specific visibility standards required for lighting use .